Grinding wheel dresser



Oct. 21, 1952 c. M. GRIFFIN 2,614,552

GRINDING WHEEL DRESSER Filed April 9, 194a 2 SI-IEETS-Si-EET 1 Ceil M.Griffin C. M. GRIFFIN GRINDING WHEEL DRESSER Oct. 21, 1952 2.SHEETS-SHEET 2 Filed April 9, 1948 Cecil MG'r iffz'n Patented Oct. 21,1952 UNITED S EN I 14 ciai'm (014125-11),

smoothly and accurately dress butler-radii angles; including: 1808concave radii; and'zthat also LincornorateS1a. means as easily:accomplishe 'ing the; important feat :oIL: dressing'vavradiusz and?two-"tangents' to the't sameiat- OIIGjZTGOHfiIlllDUSL-GII-F erati'on;Moreover my? invention; "providesrras dresser; whichamay 'iieusedimeither .ra r horizontal? or: up endedt Vertical: ipo'sitiorr, so ":as:'tflifidDt it -to'fi use: om different types'zof grinding-1 midifierenttdressing? operationszf According: toi the? present:inventiomaxthei diaa-i mondizisaiinterposedi near the as com? parativelilong-,2 .oarryiiiglrfran're having its: porting l biearmgs; at: its:extremities: With:

arrangement a: .fbetween': centers? effect is? ate; 30.

tainedi whicl'rsenhancexsmooth:"operationm -:F,lilli';ethermora,theisidewiserangles dressing.mtivenztent: is: efiiected by swingingtone'z'endizlofgthe carrying; frame about. t'hee bear-mgr".atrithe'alother "efidraS? a-:

pivot thus .im the: anglesr.'cuttinggonerationi tom: 35

the diamond interposed:befweenmidely 'spacedi bearings; resulting in:"smooth, accurate dress, ing; and, furthermore,myeinventidnrobviatesathe:- need for close-fitted, dove-tailed or ballhearing; slides; w-hioh;are diificult to;1maintain-,;-.panticular- 1yinithe ipresenceofi theagrihi'ncident toi grind-ingg operationsz Myinventionimay bezmoreifzuiiy understoodihyr referencelfito; the:accompanying: drawings; :in:' which: 3'

;.'1 ;1s:..a7.1fiUp;ip1aIl3 vim: of: ee'toolz emb delvin Fig; z isl a1sideielevationiloirthe tour snown inv- Fig: 1;:withxpa1itszthereofshowniin'seotiom': Fig. 3 is an en'divietwof theftookshowii in:lig;:l-:,-' Fig; 4' is" a. transversevertioalsection: in substanti'ally 'thBD'IaIIBiOf lineiIv- -Ivtof Fig; 2;; r

Fig-L5 is a-side elevation; also partlycin section*,., of one end' of'the device} but viewedi from the?" Fig-62 is; a detail vije, of. one?mounting: for thin dressing point this: n'iounting:"being: particularly"designed for use in dressing concavedsurfabes oit eXtremelysmalLradii; 3

Fig, 7 is: a. side; elevatiomof anothenmountin'g: fortherdressingq-toolg and-x:

Fig; 8 isia .top plan view of the Fig. 7;.

Referringto. the? drawings; the: dresser coinprises asupporting; baseframe; 2.; havingziasfizfi bottom surface so: that it :can; be;conveniently? set; on; the: table of' ai grinding machine. ltz -hasiupward: extending; supportaportions's :3 andi. 41 :at: the ends-thereof:constituting. iheadsstocki am taiL-stoclr portions; respectively-:5rigidly xoarriedz on: the support; 3 is .a fixedrdiallfi hayingeaiegeneerallyz semi-circular periphery; Thefdi'al is grain machines: s

duated; in degrees having; 0 at"; thetop-centemandi extendihgthrougharrange of. 903i degrees in each..- direction; as. best shown in- Figure3;. Passing: through the: support b is; asleeve: or spindle: 6;; Rigidlyattached tothe innerendLofi'thiS sleeve. igaucro's'si rail 1; The crossrail-T 'l-zisi-prorided at; each; end with: anupwardly-sextending:,aFrnr: 8:; eaclr :ar'mvloeingfirloent forwardly; at8a: ,oveliz thei periphery: oi the? dial 5:, The two-gforwardiw bent.portionsrzflw are oonnectedarby-ia enoss's ha ls 9i; -This':.crossj.bar'hasra.:dependingr-fingenawgiatj the:center"v thereofi which; isrigidlyyattachefii theretoz; Attached tome-"depending; fin ercis an?indicator II which moves inza. QIOQVG WZSQI -G HP? trio: with thegraduations."onrthewfaee-aofiw the dial The 'indi'cators ll may;itselfrbevgrafli ai ed; sor-"as'sto :provide a; Vernier foraccuratelyzide cne' mining:fractional degrees of 'rotat-ion Because of;thersleeve :bein'g rotatable in? the:- support fiy;

theicrosstrail 1-,- ;Which":is horizontaL-whenitheiro barprovidingatconyenientthandlefon-smmanipu whiolrz'overhangs the: rail; l1; and;throu'gmnthe giiders'silifim;isfslidablyrsupportedihyi raikilm r Theplate I6 is at the top of one arm I1 of a cradle-like carrier framehaving a horizontal connecting bar I8 and another upwardly-extending armI9. The arm I9 has a forwardlyprotruding stud element 20 near its upperend terminating in a hemispherical bearing portion which is seated inthe socket element 2| on the upright 4 of the base 2, providing auniversal pivotal bearing for that end of the carrier frame. A leafspring finger22 secured to the upright 4 has its freeend interposed in agroove in the stud member 20 to keep the hemispherical bearing seated inthe socket 2|.

By reason of the arrangement just described, rotation of the dial I3turns the pinion I4 and transmits motion to the rack I5 to move theright-hand end of the underslung frame as viewed in Fig. 2, back andforth transversely of the shaft I2, the gliders lfiasliding along thetop surface of the rail 1. Thus one end of the frame may be swung backand forth about the bearing -2I as a pivot point and transversely to theaxis of rotation of the shaft'l 2. The upright arm I! of the underslungpivoting frame is provided with an extension 23that supports a leafspring 24 having a roller 25 thereon which bears against theunder sideof the rail 1 to keep the gliders lIia in contact with the upper face ofthe rail.

The cross rail 1 has a fixed keeper 26 secured thereto, and a rod 21 isslidable back and forth in this keeper. The rod 2! as viewed in Fig. 4,

together with the rectangular block 28 and the postv 29are rigidlyassembled as one piece. The

post 29 is in a position to stop against the pin or abutment 30 in thecross rail 1, and, also, to contact the plate I 5, through the adjustingscrew 29a. A tension spring 3| has one end secured to the top of thepost 29, and has its other end se cured to a stud 32 at that edge of theplate It which is most remote from the post 29. Spring 3| thus exerts atension tending to pull the plate I5 toward the left as viewed in Fig.4, or toward the top as viewed in Fig. 1, to normally hold its edge incontact with the adjusting screw29a. When' the dial I3 is rotated in adirection tending to move the plate I6 toward the right as viewed in.

Fig. 4, the spring 3| is put under added tension because the point32moves away from the post 29. Consequently, when the knob I3 isreleased, the spring 3| will act to pull the plate I6 back against thescrew 29a.

A second tension spring 34 extending under the plate I5, also has oneend secured to the post 29. The other end of this spring 34 is anchoredto a stud 36 on the rail 1; The spring v34 thus operates sothat if thedial I3 is turned in the opposite direction, i. e., in a direction tomove the plate IB to the leftas viewed in Fig. l, the spring verticallyadjustable cross bar 40 mounted in the pivoted underslung frame. Thisbar has hand screws 4| at each end for operating clamping blocks 42 (seeFig. 1) by means of which the ends 34 will act to restore it to thecenter position.

The spring 34' cannot pull the plate IS in the opposite direction pastthe-center position because of the post 29 contacting the stop 30.

Springs 3| and 34, therefore, operate to nor-' mally keep the swingingframe centered.

Adjusting screw 29a is provided as a means of compensating for wear ofpost 29 against stop pin 30, so the diamond hereinafter described mayisto be the same as the measured setting of the diamond above or'below theaxis of rotation.

Thediamond dressing point 44, supported inv the mannerhereinafterdescribed, is carried by a of the bar are clamped to the endsof the frame to secure it in position.

Adjustment of the diamond toward or from the pivotal axis of thecarrier, for large or small radii, is accomplished by moving the crossbar 40, which may bemoved upward or downward along the uprights I1 andI9 (see Fig. 2) of the underslung rotating frame when the clamps 42 havebeen slackened by loosening the hand screws curate positioning of bar40. These jack screws are threaded throughlpins 43, which are interchangeable in the vertical series of holes in the uprights I! and I9.When the desired adjustment of the bar 40 moves it beyond the range of Vthe jack screws, pins43 are placed in higher or, lower holes, as thecase requires.

The dressing point itself isdesignated 44, and in the form of theinvention shown in Figs. 1 to 6, it is set in a supporting bar 45, theends of which are secured-to the arms of a U-shaped yoke 46, the yoke 45being rigidly secured to bar 40 by screws 41.

The bar 45, in which the diamond is set (see Figs. 1, 2 and 6) is ofdecreasing diameter from its ends towardthe diamond. Thisreduceddiameter is necessary only in dressing small concave radii,particularly when the angle turned is large, as in dressing small 180concave radii. For dressing larger concave radii and all convex radii, adiamond supporting bar of uniform. cross section throughout may be used.Also the bar 51 (see Figs. 7 and '8) in which the diamond 55 is set inthe top of a'post 56 may be used. It will be seen that the post56 istilted (10 to 15) from the perpendicular, and also, that by looseningthe clamping. screw 58 the post56 may be rotated. This tilted position,together with the rotatability, permits presentation. of a new cuttingedge when the diamond becomes dull, thus prolonging the effective lifeof the diamond. The bar 51 is interchangeable with the bar 45 shown inFig. 6. A slit milled in the bar 51 (see Fig. 8) permits loosening thepost 56 when screw v58 is unscrewed, making it easy to adjust or removethe post.

The ends of the bar 51, like the ends of the bar 45, are cut away to thecenter line of the bar, as indicated at 51a, so that the plane of thefaces 51a contains the diamond point. This is done as a means ofaccomplishing interchangeability.

To facilitate the operation in dressing angles and'tangents to radii,stops are'provided comprising the rectangular base pieces the clampingscrews 5| with wrenching handles 52, and the posts 53 which protrudefrom the base pieces 50,

to engage the dependent finger II).

To set a stop the indicator I I is brought to the desired angularposition on dial 5 and held there by using the bar 9 as a rotatinghandle or crank,

then the part is rotated about the'clamping t screw 5| until the post 53is brought against the fliiger ifl. lheiclamping screwxli's ithentightened flrmly 'by turning 'it with-the lever 52 iIhe lzpost theradius dressing operation at 54", as it would beset to:-d-ress :an angleof 34 or to: dress:a .ta'ngen fito a r-adius atanangle of 54 T0 dress-two -angles or two atangents, or an angle Lincline'd antiecloclewise tothe horizontal, the othertleft 'hand) stop is-set; using the sameprocedure as is outlined for:setting the clockwise stop.

From the foregoingii; w'illibe seen that in additionto relativelysimplegand rugged eonstruction, "my "invention provides a dresserihaving important inherent "features which-enhance its useability, whichare: I

(1) The" -diamond point -sets'- in the side ef E its supporting bar 45which is, in turn, rigidly-"supported at both ends, and'is arranged in-atangent position to the grinding -wh'eel, which permits dressing deepconcaveradii (up t0"l-80-) without requiring a special attachment. Il is construction "also provides a maximum ofrigidity and accuracy ofalignment for the "diamond point which i i's-particularly important I indressing very small :con'cave radii.

' (2-) Dials are positioned where *they" are out derstood that thisisby=waypfillustration,and

that-various-changes "and -modiiications may be made in the constructionand "arrangement of parts within the contemplation of *my invention,

and under thegscope ofthefollowing claims.

I claim:

l. A radius ,and angle dresser for grinding wheels comprising a basewith upright headstock and tail-stock portions at'itsends containingbearing systems, said bearing systems having a .commonaxis forrotation,zsaid headstock bearing system supporting a rotatablespindleinrigidalignment, aportion of thespindle projecting fromthe innerfaceofthe head-stock, araiI-rigidIy attached crosswise of said spindleprojection and rotatable with the spindle, a rotatable carrierframeextending'between the rail and the answer, a cutting -nib adjustablymounted: on the carrier frame intermediate the ends thereof,meansconnecting the carrier, frame to the rail providing forcoincidental rotation of the frame and the rail and also for sidewisemovement of the end of the carrier frame along the rail to effectangular displacement of the carrier frame about its pivot axis in thetailstock bearing system, said tail-stock bearing system functioning toprovide support for the carrier frame in both rotational and angulardisplacement, a graduated scale on the headstock, handle means attachedto said rail for rotating the rail and carrier and having an indicatorthereonrterniinatingradjaceritaaidisoale,zmimoi:

'outsideiof the headstock' and connected'iwithfzthe carrier, and rmeansactuated :by :tthe :knob 'ifOl effecting angular-:movement ofthacarriert frame.

2; radius and :angle dresser "for grinding wheels as I-descri-bed-l inclaim 1 1, whereintthe .-:cutting 'n'ib is set in'thesid'e of a rod, therod:b'eing supported at its ends, 1 that portion :of the rod between''the --supp'or-ts being i in clear suspension, the r cutting nib beingi set in the suspended :por tion "of the red, the i longitudinalaxis'o'f the rod being parallel" to the eaxis of *rotation on thecarrier frame.

"3. A radius "and angle dresser asdefined-- in claim "2, wherein thesuspended portion of the rod, in whi'ch the cutting nib is setfiis oftie-- creased 1 diameter to permit? dres-sing smallfideep, concaveradii.

4. A radius --and angle dresser as 1 defined claim Wherein the bottom*and -the man-steel; end of the-base are flattenedsothe dresser willstand'securely on a flat surface in-either a horizontal'ora verticalposition.

5. A radius and angle "dressera's defined in claim *4, a centering stopon "said carrier *frame supporting means, springmeansresistingmovemerit, of the carrier frame along the rail from, andautomatically returning it to, said'c'entering stop, and adjustingmeans-on said stop-:to-adj-ust the centered position ofthe'carrieryframe thereby to "accurately align "the cutting nib in theplane-perpendicular to its-plane of sidewise movement and containingtheaxis of rotation.

6. A radius and angle dresser 'for'grinding wheels comprising -abasewith upright headstock and tail-stock1 portionsat its endscontaining bearing systems, said bearingsystems having a common "axisfor "rotation, "said head-stock bearing-system supportingarotatablespindle' in rigidalignment, a portion of-the spindle projecting'fromtheinner faceof the head-stock, a rail rigidly attached crosswise ofsaid spindle projection and rotatable with the spindle, 'a "ro-' tatablecarrier frame extending between the rail and the tail-stock, a cuttingnib adjustably mounted intermediate-the ends of 'the carrier frame,means connecting the carrier frame to the rail providing forcoincidental rotation of the frame and the 'railand also for sidewisemovement ofthe end of the carrier-frame-along the'rail to effectangular-displacement of the carrier frame about its pivot axisr'inthe'tail-stock bearing system, :said "tail-r stock hearing systemfunctioning to provide support for the carrier frame in both "rotationaland angular displacemerit, :a graduated scale on the .head=stock, handle-means attached to the rail "for rotating the rail "and the carrierhaving tan indicator thereon terminating adjacent said scale,.a knoboutside of the head-stock, cooperating means actuatedby the knob andconnected with 'the'ca-rrier for effecting angular movement of thecarrier, and adjustable 'stops'on the'head-"stockin said spindleprojection and rotatable with the spindle, a rotatable carrier frameextending be-' tween the rail and the tail-stock, a cutting nibadjustably mounted intermediate the ends of the carrier frame, meansconnecting the carrier frame to the rail providing for coincidentalrotation of the frame and the rail and also for sidewise movement of theend of the carrier frame along the rail to effect angular displacementof the carrier frame about its pivot axis in the tail-stock bearingsystem, said tail-stock bearing system functioning to provide supportfor the carrier frame in both rotational and angular displacement, agraduated scale on the head-stock, handle means on the rail for rotatingthe rail and the carrier having an indicator thereon terminatingadjacent said scale, a knob outside of the head-stock, cooperating meansactuated by the knob and connected with the carrier for effectingangular movement of the carrier, adjustable stops on the head-stock inthe path of movement of said handle for limiting the rotational movementof the carrier in either direction, the carrier frame being underslung,comprising a bar portion having an arm at each end thereof, a cross baradjustably supported on said arms for movement radially to the axisabout which the carrier frame rotates, and a cutting nib mounted on saidbar.

8. A radius and angle dresser as defined in U bearing system for lendingpivotal support, said bearing systems being aligned to have a commonpivotal axis, a spindle rotatably supported in the head-stock bearingsystem, a rail fixed to and rotatable with the spindle and extendingcrosswise said pivotal axis adjacent the inner face of the head-stock, acradle-like carrier comprisinga bar with upturned ends extending betweenand supported by the rail and the tail-stock bearing system, meansconnecting the carrier to the rail for holding them together forrotation as one and permitting sidewise movement of the end of thecarrier along the rail to effect angular displacement of the carrierabout a pivot axis in the tail-stock hearing system, said tail-stockbearing system functioning universally to provide support for thecarrier in both rotational and angular displacement, a cutting nibmounted on the carrier intermediate the ends thereof, a graduated dialattached to the head-stock, a pointer connected by rigid interconnectingmeans to the rail and arranged to move along the dial graduations whenthe carrier is rotated to indicate the degree of rotation of the cuttingnib, means operatively connected to the carrier for producing theside-to-side movement of the end of the carrier along the rail, anabutment pin on the rail, means acting in conjunction with the abutmentpin to yieldably resist the side-to-side movement for arresting andholding the carrier at central position when side-to-side actuatingforces are relinquished during radius shaping operations.

10. A radius and angle shaping device as defined in claim 9 wherein thecutting nib is mounted on a bar'which extends between and is adjustablysupported at its ends for up and down adjustment on the upturned ends ofthe cradle-like carrier, whereby adjustment of the cutting nib towardand from the axis of rotation of the carrier is effected.

11. A radius and angle shaping device as defined in claim 10 wherein thecutting nib is set in the side of a relatively slender rod which isconnected at its ends only to the adjustably supported bar and held inspaced relation above the bar.

12. A radius and angle shaping device as defined in claim 9 wherein themeans for centering and holding the carrier at central positioncomprises two tension springs and a movable member with one end of bothattached to the movable member and both springs exerting force on saidmovable member in substantially the same direction, the other ends ofthe two springs being attached one to the rail and the other to thecarrier the movable member stopping against the abutment pin when thecarrier is at central position.

13. A radius and angle shaping device as defined in claim 9 wherein saidrigid interconnecting means between the rail and the pointer comprisesarms which extend from the rail over the periphery of the dial wherethey are connected with a member which extends across the face of thedial and lends support for the pointer and wherein said arms andconnected member are so arranged to serve as a manipulable handle forrotation of the carrier.

14. A radius and angle dresser as defined in claim 13 wherein there areadjustable stops arranged to arrest the rotational movement at anypredetermined degree of rotation, there being one stop to arrest theclockwise rotation and another to arrest the counterclockwise rotation.

CECIL M. GRIFFIN.

, REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,448,239 Schuessler Mar. 13,1923 2,028,42e Dillen Jan. 21, 1936 2,294,008 Turrettini Aug. 25, 19422,360,013 Renner Oct. 10, 1944 FOREIGN PATENTS Number Country Date501,021 Great Britain Feb. 20, 1939

